This paper analyzes the fault factors of DC750 V traction power supply system and uses the theories such as accident-causing theory, fault tree model theory and probability theory to establish the fault tree model with the DC750 V electricity accident as the top event. By calculating the structure degree, probability degree and critical degree of the bottom event in the DC750 V electricity accident, we can obtain the primary causes to the interruption of DC750 V'power supply and propose the corresponding risk control measures. It turns out to be that this method has a certain reference value for the security risk assessment, analysis of the component effects and identification of the weak links of the DC750 V power supply system security. It can provide a basis for the manager to make decisions and has a great value to assure the subway operation security.%通过对影响750 V直流牵引供电系统故障因素的分析,利用事故致因理论、故障树模型和概率论相关理论结构度、概率度、临界度计算,得出影响750 V断电事故的主要因素,并提出相应的风险控制措施.结果表明该方法对750 V供电系统安全风险评估、部件影响分析、薄弱环节识别,以及为管理者的决策具有一定的参考价值,对保证地铁运营安全具有重要意义.
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